Assume that y varies directly with x, then solve if y=12 when x=15, find x when y=21

and can someone explain to me how they got the answer because i got 16.8

160 students attended Music Night on Thursday night. The attendance on Friday was 120% of the attendance on Thursday night. The attendance on Saturday night was 75% of the attendance on Friday night.

There are two coins, one is fair and one is biased. The biased coin has a probability of landing on heads equal to 4/5. One of the coins is chosen at random (50-50), and is flipped repeatedly until it lands on tail.

Which fraction is equivalent to? 2/12?

Simplify - 3 (-6i) + (5i) (-1+3i)

In expanded form 2,802,136

How many solutions does the following equation have? - 14 (z-5) = -14z+70-14 (z-5) = -14z+70

What is 5+-1/3 in fraction form

Solve the equation - 4h 16 = - 16 for h. a. - 10 b. - 8 c. - 7 d. 8

Can you solve this in slope intercept form M = - 2/3; (3, 4)

Explain what it means to divide 5 by 1/4